Hi,
This is a logon issue.
You have to start the MSSQLSERVER before you can run the SQLSERVER agent
Follow the steps below:
Click on start on the taskbar
click on run
type in: services. msc, then ok
On the servies pane look for MSSQLSERVER and double click on it.
Click on the log on tab
on the Log on as deselect This account and select Local System account option button
click on apply.
click on the general tab and click on start.
click on ok
that starts your MSSQLSERVER
Thereafter you can start your SQLSERVERAGENT.
I hope this sorts your problem